CN104377827B - A kind of photovoltaic DC power supply - Google Patents
A kind of photovoltaic DC power supply Download PDFInfo
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- CN104377827B CN104377827B CN201410673444.1A CN201410673444A CN104377827B CN 104377827 B CN104377827 B CN 104377827B CN 201410673444 A CN201410673444 A CN 201410673444A CN 104377827 B CN104377827 B CN 104377827B
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- photovoltaic
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
Abstract
The invention discloses a kind of photovoltaic DC power supply, including multiple unit modules and communication unit, control unit, all of unit module is all connected with control unit and communication unit, each unit module all includes input and collects unit, data acquisition unit, boosting unit and Fault Isolation unit, described input is collected unit and is connected with photovoltaic module, described data acquisition unit is used for collection voltages and current state signal, described boosting unit is used for carrying out staggered copped wave and working in MPPT pattern, the instruction that described Fault Isolation unit is assigned for reception control unit turns off and closes.The present invention has the advantages that to support that multichannel MPPT of photovoltaic array controls, possesses photovoltaic module combining functions.
Description
Technical field
Present invention relates generally to technical field of photovoltaic power generation, refer in particular to a kind of photovoltaic DC being applied to photovoltaic generating system
Power supply.
Background technology
In normal operating conditions, U-I the and P-I characteristic curve of photovoltaic cell with irradiance and temperature change and presents
Typical nonlinear characteristic.Because single photovoltaic module output voltage electric current is low, carry out again by component string and after connecting in engineering
The factors meeting such as inconsistent to the blocking of cell panel, assembly temperature and layout orientation of transformation of electrical energy, cloud layer or other objects
Lead to the power mismatch of photovoltaic group string, multichannel MPPT is the universal means solving this problem.
At present, (MPPT is maximum power point tracking technology to tradition solution photovoltaic array multichannel MPPT：maximum power
Point tracking, makes distributed generation system be maintained at its maximum power output state) one of mode be using group string
Formula inverter replaces traditional header box and centralized inverter；Its inside contains boost module and inversion module.Its shortcoming is just
It is：Relatively costly, single-machine capacity is little, and the parallel-connection structure of output AC makes wiring complicate, and the electrical network of plural parallel stage adapts to energy
Power is poor.
Content of the invention
The technical problem to be solved in the present invention is that：The technical problem existing for prior art, the present invention provides one
Plant and can support that multichannel MPPT of photovoltaic array controls, possesses the photovoltaic DC power supply of photovoltaic module combining functions.
For solving above-mentioned technical problem, the present invention employs the following technical solutions：
A kind of photovoltaic DC power supply, including multiple unit modules and communication unit, control unit, all of unit module is equal
It is connected with control unit and communication unit, each unit module all includes input and collects unit, data acquisition unit, boosting unit
And Fault Isolation unit, described input collected unit and is connected with photovoltaic module, described data acquisition unit be used for collection voltages and
Current state signal, described boosting unit is used for carrying out staggered copped wave and working in MPPT pattern, and described Fault Isolation unit is used
Carry out the instruction that reception control unit assigns to turn off and close.
As a further improvement on the present invention：It is defeated that described input collects that unit includes that two or more is connected with photovoltaic module
Approach, each input road is all in series with fuse.
As a further improvement on the present invention：Described Fault Isolation unit includes a dc circuit breaker.
As a further improvement on the present invention：Described boosting unit includes an input capacitance, two band backward diodes
IGBT module, two inductance, two major loop diodes, an output capacitance and two bypass diodes.
As a further improvement on the present invention：It is higher than output voltage when described data acquisition unit detects input voltage,
Boost chopper in described boosting unit does not work, and electric current is passed through by bypass diode；When input voltage is less than output electricity
Pressure, the boost chopper work of described boosting unit, described bypass diode turns off, and two-way boost chopper is according to MPPT
Requirement carry out staggered copped wave output.
As a further improvement on the present invention：It is provided with drive circuit, for straight between described control unit and boosting unit
Connect the instruction of reception control unit and then drive boost chopper.
Compared with prior art, it is an advantage of the current invention that：
1st, the photovoltaic DC power supply of the present invention, can be applicable to the use occasion of centralized inverter, and this device adopts module
Change design, possess photovoltaic conflux function.The present invention can realize the MPPT of multichannel input simultaneously；When a certain road, input photovoltaic module goes out
Existing fault, device can intelligently be isolated and be uploaded alarm signal and so that other normal branch roads is continued to run with；Can be when loading less
Keep in the case that MPPT quantity is constant, making partial branch intelligence dormancy, thus reduce loss.
2nd, the photovoltaic DC power supply of the present invention, possesses photovoltaic conflux and multichannel MPPT function, enables to input the event of branch road
Phragma, from reporting to the police and intelligent dormancy, improves reliability and the generated energy of system.
Brief description
Fig. 1 is the structural framing schematic diagram of the present invention.
Fig. 2 is principle schematic diagram. in concrete application example for the present invention.
Fig. 3 is the principle schematic diagram. of present invention boosting unit in concrete application example.
Fig. 4 is operation principle schematic diagram in concrete application example for the present invention.
Marginal data：
101st, input collects unit；102nd, data acquisition unit；103rd, communication unit；104th, boosting unit；105th, fault
Isolated location；106th, control unit；207th, drive circuit；301st, input capacitance；302nd, IGBT module；303rd, inductance；304th, main
Loop diode；305th, output capacitance；306th, bypass diode.
Specific embodiment
Below with reference to Figure of description and specific embodiment, the present invention is described in further details.
As shown in figure 1, the photovoltaic DC power supply of the present invention, using modularized design, it includes multiple unit modules and leads to
News unit 103, control unit 106, all of unit module is all connected with control unit 106 and communication unit 103, each unit
Module all includes input and collects unit 101, data acquisition unit 102, boosting unit 104 and Fault Isolation unit 105.
As shown in Fig. 2 the input in unit module collects unit 101 includes the input that two or more is connected with photovoltaic module
Branch road, each input branch road is all in series with fuse, and that is, the quantity of fuse is corresponding with the quantity of input branch road.Data acquisition list
Unit 102 includes voltage sensor and current sensor, for the voltage and current of collecting unit module.Boosting unit 104 is by two
Individual boost chopper (boost circuit) and two band bypass diodes are formed in parallel, and can interlock copped wave work in MPPT
Pattern.Fault Isolation unit 105 includes a dc circuit breaker, can the instruction assigned of reception control unit 106 turn off with
Closure.
In the present embodiment, communication unit 103 is shared by multiple unit modules, the data message of receiving unit module and on
Pass monitoring.In concrete application, the communication modes of communication unit 103 can be RS485, Ethernet etc. wired or
The wireless modes such as wifi, GPRS.Control unit 106 is similarly multiple unit modules and is shared, for data processing and to boosting
Unit 104 and Fault Isolation unit 105 assign instruction.
In the present embodiment, also include drive circuit 207 between control unit 106 and boosting unit 104, for directly connecing
Receive the instruction of control unit 106 and then drive boost chopper (boost circuit).
As shown in figure 3, in the present embodiment, input positive pole and the input of boosting unit 104 collect the output cathode of unit 101
It is connected, the output negative pole that input negative pole collects unit 101 with input is connected.Boosting unit 104 include an input capacitance 301,
Two IGBT module 302 (band backward diode), two inductance, 304, output capacitance 305 of 303, two major loop diodes
With two bypass diodes 306.Wherein, it is connected to input capacitance 301 between input both positive and negative polarity to be used for stablizing input voltage and realization
Energy transmission；It is connected to output capacitance 305 for regulated output voltage and filtering between output both positive and negative polarity；Inductance 303 is respectively and main
In parallel with bypass diode 306 again after loop diode 304 series connection, the C pole of IGBT module 302 respectively with major loop diode
304 anode is connected, and the E pole of IGBT module 302 is connected with major loop negative pole respectively.Constitute the double bypass diode of band
Two-in-parallel boost circuit.
As shown in figure 4, the operation principle of the photovoltaic DC power supply of the present invention is：Due to adopting modularized design, therefore here
Only introduce the operation principle of only element module.Referring to Fig. 2, multichannel photovoltaic module collects unit 101 by input and collects, using fusing
Device makes it possess excessively stream and short-circuit protection.Collect through input after unit 101 collects, by the voltage electricity of data acquisition unit 102
Flow sensor collection voltages electric current delivering in control unit 106 is processed.If abnormal, control unit in voltage x current
Fault message is uploaded to monitoring by controlling switching off in Fault Isolation unit 105 to connect and by communication unit 103 by 106
System, thus will not cause inverter to shut down because of protection, and other normal modules can work on, and is also convenient for attendant couple
The positioning of abort situation.
Referring to Fig. 3, when input voltage is higher than output voltage, the boost circuit in boosting unit 104 does not work, and electric current
Passed through by bypass diode 306.When input voltage is less than output voltage, the boost circuit work of boosting unit 104, and bypass
Diode 306 turns off, and two-way boost circuit carries out staggered copped wave output according to the requirement of MPPT.Now, if input power is less
(for example：Less than A value), control unit 106 will make a two-way boost circuit dormancy wherein road so that reduce loss, described A value by
Enable an efficiency test and analysis during road boost and two-way boost under different capacity grade respectively to determine.
The above is only the preferred embodiment of the present invention, protection scope of the present invention is not limited merely to above-described embodiment,
All technical schemes belonging under thinking of the present invention belong to protection scope of the present invention.It should be pointed out that for the art
For those of ordinary skill, some improvements and modifications without departing from the principles of the present invention, should be regarded as the protection of the present invention
Scope.
Claims (4)
1. a kind of photovoltaic DC power supply is it is characterised in that include multiple unit modules and communication unit（103）, control unit
（106）, all of unit module is all and control unit（106）And communication unit（103）It is connected, each unit module all includes defeated
Enter to collect unit（101）, data acquisition unit（102）, boosting unit（104）And Fault Isolation unit（105）, described input remittance
Collection unit（101）It is connected with photovoltaic module, described data acquisition unit（102）For collection voltages and current state signal, institute
State boosting unit（104）It is used for carrying out staggered copped wave and working in MPPT pattern, described Fault Isolation unit（105）It is used for receiving
Control unit（106）The instruction assigned turns off and closes；Described boosting unit（104）Including an input capacitance（301）、
Two IGBT module with backward diode（302）, two inductance（303）, two major loop diodes（304）, an output
Electric capacity（305）With two bypass diodes（306）；When described data acquisition unit（102）Input voltage is detected is higher than output
Voltage, described boosting unit（104）In boost chopper do not work, electric current is by bypass diode（306）Pass through；Work as input
Voltage is less than output voltage, described boosting unit（104）Boost chopper work, described bypass diode（306）Turn off,
Two-way boost chopper carries out staggered copped wave output according to the requirement of MPPT.
2. photovoltaic DC power supply according to claim 1 is it is characterised in that described input collects unit（101）Including two
The individual above input road being connected with photovoltaic module, each input road is all in series with fuse.
3. photovoltaic DC power supply according to claim 1 is it is characterised in that described Fault Isolation unit（105）Including one
Individual dc circuit breaker.
4. photovoltaic DC power supply according to claim 1 is it is characterised in that described control unit（106）With boosting unit
（104）Between be provided with drive circuit（207）, for directly receiving control unit（106）Instruction then drive boost chopper electricity
Road.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410673444.1A CN104377827B (en) | 2014-11-21 | 2014-11-21 | A kind of photovoltaic DC power supply |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410673444.1A CN104377827B (en) | 2014-11-21 | 2014-11-21 | A kind of photovoltaic DC power supply |
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| Publication Number | Publication Date |
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| CN104377827A CN104377827A (en) | 2015-02-25 |
| CN104377827B true CN104377827B (en) | 2017-03-01 |
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| CN201410673444.1A Active CN104377827B (en) | 2014-11-21 | 2014-11-21 | A kind of photovoltaic DC power supply |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105515513B (en) * | 2016-01-29 | 2018-08-03 | 阳光电源股份有限公司 | A kind of photovoltaic DC-to-AC converter and its control method |
| US20220216791A1 (en) * | 2019-06-07 | 2022-07-07 | Panasonic Intellectual Property Management Co., Ltd. | In-vehicle power supply system |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102820808A (en) * | 2011-06-10 | 2012-12-12 | 特变电工新疆新能源股份有限公司 | Photovoltaic array combiner box |
| CN102882233A (en) * | 2012-10-12 | 2013-01-16 | 吴加林 | Medium-voltage distribution type maximum power point tracking (MPPT) large-power photovoltaic grid-connected power station |
| CN203617965U (en) * | 2013-12-09 | 2014-05-28 | 北京科诺伟业科技股份有限公司 | Photovoltaic string/array output power optimization, combining, fire hazard monitoring device |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2483317B (en) * | 2011-01-12 | 2012-08-22 | Solaredge Technologies Ltd | Serially connected inverters |
| CN103529899B (en) * | 2013-10-17 | 2015-10-21 | 深圳市禾望电气股份有限公司 | MPPT controller, power tracking device, photovoltaic generation and accumulator system |
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2014
- 2014-11-21 CN CN201410673444.1A patent/CN104377827B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102820808A (en) * | 2011-06-10 | 2012-12-12 | 特变电工新疆新能源股份有限公司 | Photovoltaic array combiner box |
| CN102882233A (en) * | 2012-10-12 | 2013-01-16 | 吴加林 | Medium-voltage distribution type maximum power point tracking (MPPT) large-power photovoltaic grid-connected power station |
| CN203617965U (en) * | 2013-12-09 | 2014-05-28 | 北京科诺伟业科技股份有限公司 | Photovoltaic string/array output power optimization, combining, fire hazard monitoring device |
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